Nunit Negative Tests Expected Exception

Question

I have a class that I check the index or the length of the string. And I want to write a Nunit Negative Test:

if the length of the string Out of Range the Nunit Test is true. Or the first index is digit "false" the Nunit Test is true.

What i try:

My CheckKeyClass:

public void SetKey(string keyToAnalyse) 
{
  Line = new string[keyToAnalyse.Length];
  int nummeric;
  bool num;  

  if (Line.Length == 0 || Line.Length < 24) 
  {
    throw new Exception("Index Out of Range " + Line.Length);
  }
  // Ist Product a Character
  num = int.TryParse(Line[0], out nummeric);
  if (!num) 
  {
    if (Line[0] == "K") 
    {
      Product = 0;
    }
  } 
  else 
  {
    throw new Exception("The Productnumber is not right: " + Line[0] ". \nPlease give a Character.");
  }
}

My Nunit Test:

[Test]
public void NegativeTests() 
{
  keymanager.SetKey("KM6163-33583-01125-68785");
  // Throws<ArgumentOutOfRangeException>(() => keymanager.Line[24]);
}

// ExpectedException Handling
public static void Throws<T>(Action func) where T : Exception 
{
  var exceptionThrown = false;
  try 
  {
    func.Invoke();
  } 
  catch (T) 
  {
    exceptionThrown = true;
  }

  if (!exceptionThrown) 
  {
    throw new AssertFailedException(String.Format("An exception of type {0} was expected, but not thrown", typeof(T)));
  }
}

So if the Line.length Out of Range the Test must be green also true. How do I use that the Tests is true?

thx

can you not use the built-in Assert.Throws<T>?

Cristian Lupascu
– Cristian Lupascu

2013-10-02 07:14:20 +00:00
Commented Oct 2, 2013 at 7:14 — Cristian Lupascu
– Cristian Lupascu, Commented Oct 2, 2013 at 7:14

Community · Accepted Answer · 2017-05-23 11:57:32Z

2

Use Assert.Throws()

string keyHasLengthOf24 = "KM6163-33583-01125-68785";

var ex = Assert.Throws<Exception>(() => keymanager.SetKey(keyHasLengthOf24));

Assert.That(ex.Message, Is.EqualTo("Index Out of Range "));

See this SO answer for further detail.

edited May 23, 2017 at 11:57

CommunityBot

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answered Oct 2, 2013 at 7:14

Sam Leach

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